Feed-water heater.



J. POLLOGK.

FEED WATER HEATER. 'APPLIUATION FILED APR. 6, 1909.

932,8 1 O. Patented Aug. 31, 1909.

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J. POLLOGK.

FEED WATER HEATER. APPLIQATION FILED APR. 6. 1909. 932,810, PatentedAug. 31, 1909.

2 SHEETS -SHEET Z.

UNITED STATES PATENT oEEioE.

JOHN POLLOGK, 0F BELFAST, IRELAND.

FEED-WATER HEATER.

To all whom 'it may concern:

Be it known that I, J OI-IN PoLLooK, a subject of the King of GreatBritain, residing at Belfast, Ireland, have invented certain new anduseful Improvements in Feed- IVater Heaters, of which the following is aspecification.

This invention relates to feed water heaters for use in connection withsteam boilers in which steam is used for raising the feed water to thedesired temperature before feeding same to the boiler.

It is well known in feed water heaters to use a supply of live steam, orexhaust steam for heating the feed water, but, as in some instances,suflicient live steam cannot be spared from the steam supply for feedwater heating purposes, and as exhaust steam is not always available,the object of the present invention is to construct a simple andefficient feed water heater in which either live steam or exhaust steamor a combination of these can be used for raising the feed water to thedesired temperature.

In order that my said invention may be properly understood I havehereunto appended two explanatory sheets of drawings,

whereon:

Figure 1 is an external view of a feed water heater as constructed underthis invention. Fig. 2 is a vertical section of same.

Fig. 3 is a detail view of a modification of the controlling device forcontrolling the steam admission valve of pump.

In carrying out my invention the heater preferably consists of asuitable cylinder or casing A which is divided into upper and lowercompartments 1, 2, by means of a division plate (4 having a centralopening I). The cylinder or casing A is closed at top and bottom bymeans of suitable end pieces 0, (Z, while fitted in each compartment areinverted hollow stepped cones c, f.

The upper compartment 1 is provided with a connection 9 to the exhauststeam supply while an inlet h for the feed water is also provided. Adome-shaped or conical cover 2' is also provided, which fits inside theupper end of the inverted hollow stepped cone 6 being suitably securedat e to the upper end piece a.

The inverted hollow stepped cone f fitted in the lower compartment 2 ismade with an annular wall f and is also provided with a dome-shaped orconical cover y having a passageway j formed in it to which a sup-Specification of Letters Patent.

Application filed April 6, 1909.

Patented Aug. 31, 1909.

Serial No. 488,229.

the interior of the cone 7, is made in the lower part (1 of the cylinderor casing A for a pipe connection to the discharge from feed pump whilean opening 111. is made for the pipe connection to the suction to feedpump,

A connection for discharge to the boiler is also made at a while asuitable blow off connection 0 is made at the bottom d of the cyl inderor casing A and a sediment drain connection p is also provided. An aircock '0 and a safety valve to would also be fitted.

Fitted to the side of the cylinder or casing A and communicating withthe interior thereof at g and r, is a controlling chest B provided witha central spindle s on which works a sleeve 23 to which is fitted oneend of a lever a whose other end may be provided with a counterbalanceweight 25 and is suitably connected with the steam admission valve offeed pump tor automatically stopping and starting same accordingtoheight of feed water in heater. A float t is fitted in connection withthe sleeve t so as to be capable of rising and falling thereon inaccordance with the level of the feed water in the compartment 2, thearrangement being such that when the water level rises in the lower partof the cylinder or casing A it also rises in the controlling chest B,thereby raising the float t until it contacts with the upper end of thesleeve 7? which is thereupon raised, and moving the lever it opens thesteam valve of the feed pump so as to actuate same and cause the waterto be drawn off by the opening an to the pump from which it isdischarged by means of pipe connection and opening Z to the interior ofthe stepped cone 7 from whence it passes to the boiler by means of theopening a. As long as there is a sufficiency of feed water in the lowerpart of the cylinder or casing A. to keep the float t in the positionindicated in Fig. 2, the pump will remain in operation, but when thesupply of feed water diminishes so that the float 6 falls until itcontacts with the lower end of the sleeve 2, then the weight of thefloat t depresses the sleeve 25 and reversing the movement of the leverit automatically stops the pump until the supply of water I againincreases sufi'iciently to restart it. lVith this arrangement thedrawing off of steam and vapor is prevented.

Fig. 3 shows a slightly modified arrangement for actuating the feedpump. In this this arrangement only the lower inverted stepped cone fmay. be used if desired.

While, by way of example, the improved feed water heater has beendescribed in con nection with a marine installation it will be obviousthat it can be used equally well in other installations and that witheconomical and successtul results.

arrangement the float t is dispensed wit-h--- The improved apparatus canbe easily and a hollow vessel open at its upper end substitutedtherefor. The vessel 25 is connected with the lever 14 by means oflinks 1. and when the pump is in operation the vessel if" rests at thebottom of the chest B the lift valve 26* being thereby raised oft itsseat so that the interior of the vessel t is in, communication with theinterior of the controlling chest B with the result that when the feedwater in the cylinder or casing A falls to the level indicated by thedotted line X the vessel 75 is empty, and under the action of thecounter-balance weight t it rises to the position indicated in dottedlines, while, at the same time, the downward movement of the outer endof the lever 1! stops the pump. .Vhen the feed water rises again in theinterior of the cylinder or casing A to the level indicated by thedotted line Y the water then overflows into the hollow vessel t whichthereupon sinks downward and raising the outer end of the lever u startsthe feed pump once more for the purpose of withdrawing the feed water inthe manner already described.

lVith a feed water heater, such as described, in a marine installation,for example, when the main engines are working and there is a sutficientsupply of exhaust steam, the feed water can be raised to the desiredtemperature by this agency alone, or it preferred, in addition, a smallquantity of live steam may be used. The act-ion of the apparatus is suchthat the feed water enters at the feed inlet 72 fills the interior ofthe upper compartment 1 passes over the lip of the hollow stepped cone6, as shown by the arrows, meets and mixes with the exhaust steamentering at g, is heated and falls to the bottom of the cylinder orcasing A. It is drawn from thence by the opening m to the feed pumpwhich again discharges it to the heater by the inlet Z whence it passesupward and over the lip of the second cone 7 where it may meet and mixwith live steam from the pipe Z: finally passing to the boiler by meansof the discharge opening a. It enters the boiler at about the sametemperature as the steam therein.

Should it be desired to use the feed water heater in port when the mainengines are not working and there is no exhaust steam supply availablethe action of the apparatus is the same but a slightly larger supply oflive steam will be required to raise the feed water to the requiredtemperature. With taken to pieces for cleaning or repairing whenrequired, and the scale or sediment collected can be readily blown offwhen necessary by means of the blow off connections 0 and 7), while thefeed water supply may be so arranged that, if desired, it can at anytime be fed direct to the boiler independent of the feed water heater.

Having now fully described my invention what I claim and desire tosecure by Letters Patent is 1. A feed water heater for steam boilerscomprising in combination, a cylinder or casing divided into upper andlower compartments, an inverted hollow stepped cone fitted in eachcompartment, the upper stepped cone being in communication with thelower compartment and the lower stepped cone which is provided with asteam-tight cover being also in communication with the lower compartmentand with the boiler.

2. A feed water heater for steam boilers comprising in combination, acasing divided into upper and lower compartments the lower compartmentbeing provided with a blow oif connection, an inverted hollow steppedcone fitted in each compartment, the upper stepped cone being incommunication with the lower compartment, and the lower stepped conewhich is provided with a steam tight cover being also incon'nnu'nication with the lower compartn'ient and with the boiler.

3. A feed water heater for steam boilers comprising, in combination, acasing divided into upper and lower compartments the lower compartmentbeing provided with a blow-off connection, an inverted hollow steppedcone fitted in each compartment, the upper stepped cone being incommunication with the lower compartment, a dome cover for the upperstepped cone and means for connecting the lower stepped cone, which isprovided with a steam tight cover, with the lower compartment and withthe boiler.

t. A feed water heater for steam boilers comprising in combination, acasing divided into upper and lower compartments, an inverted hollowstepped cone fitted in the upper compartment, an inverted hollow steppedsteam tight cone having a scale or sediment collector and blow offconnection fitted in the lower compartment, means for admitting feedwater and exhaust steam to the upper compartment and the upper invertedhollow stepped cone and discharging it to the lower compartment and thelower inverted hollow stepped cone, means for supplying live steam tothe lower inverted hollow stepped cone and means for discharging thefeed water therefrom to the boiler;

5. A. feed water heater for steam boilers comprising, in combination, acasing clivided into upper and lower compartments, an inverted hollowstepped cone fitted in the upper compartment, an inverted hollow steppedcone having an annular wall and a steam tight cover provided with asteam passage way fitted in the lower compartment, means for admittingfeed water and exhaust steam to the upper compartment and the upperinverted hollow stepped cone, means for discharging the same to thelower compartment and the lower inverted hollow stepped cone, means forsupplying live steam to the lower inverted hollow stepped cone and meansfor discharging the feed water therefrom to the boiler.

6. A feed water heater for steam boilers comprising, in combination, acasing divided into upperand lower compartments, an inverted hollowstepped cone fitted in the upper compartment, an inverted hollow steppedsteam tight cone having a scale or sediment collector and blow offconnection fitted in the lower compartment, means for admitting feed'ater and exhaust steam to the upper compartment and the upper invertedhollow stepped cone and for discharging it to the lower compartment andthe lower inverted hollow stepped cone, means for supplying live steamto the lower inverted hollow stepped cone, automatic means forregulating the discharge of the feed water from the lower compartment tothe lower inverted hollow stepped steam tight cone and means fordischarging the feed water to the boiler.

7. A feed water heater for steam boilers comprising, in combination, acasing divided into upper and lower compartments, an inverted hollowstepped cone fitted in the upper compartment, an inverted hollow steppedsteam tight cone having a scale or sediment collector and blow offconnection fitted in the lower compartment, means for admittingfeed-water and exhaust steam to the upper compartment and the upperinverted hollow stepped cone, means for discharging the same to thelower compartment and the lower inverted hollow stepped cone, means forsupplying live steam to the lower inverted hollow stepped cone, acontrolling chest secured to the exterior of the casing andcommunicating with the interior thereof, a spindle fitted in the chest,a float working on the spindle, and a lever actuated by said float forcontrolling the discharge of feed water from the lower compartment tothe interior of the lower inverted hollow stepped steanrtight cone.

8. A feed water heater for steam boilers comprising, in combination, acasing divided into upper and lower compartments, an inverted hollowstepped cone fitted in the upper compartment, an inverted hollow steppedsteam tight cone having a scale or sediment collector and blow offconnection fitted in the lower compartment, means for admitting feedwater and exhaust steam to the upper compartment and the upper invertedhollow stepped cone, means for discharging it to the lower compartmentand the lower inverted hollow stepped cone,

means for supplying live steam to the lower inverted hollow steppedcone, a controlling chest secured to the exterior of the casing andcommunicating with the interior thereof, a spindle fitted in the chest,a hollow vessel open at its upper end working on the spindle, a liftvalve fitted in the hollow vessel a lever for controlling the means forthe discharge of feed water from the lower compartment to the lowerinverted hollow stepped steam-tight cone and means for connecting thehollow vessel with said lever.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN POLLOCK.

